The 624 is a leather cross-trainer style which is available for both men and women. Leather provides a natural, breathable upper that is durable and easy to clean. The style features dual density ABZORB® cushioning in the mid-foot and heel. This is a key difference that separates the 624 from most of its peers in the price class. This additional cushion is instantly noticeable, and it makes all of the difference after a long day on your feet. This is great for people who require orthotics or who have other medical issues.